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US 10,118,885 B2Granted
Method and apparatus for carbonylating methanol with acetic acid enriched flash stream
AssigneeCelanese International Corporation
InventorJeremy J. Patt
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Abstract
A carbonylation process for producing acetic acid including: (a) carbonylating methanol or its reactive derivatives in the presence of a Group VIII metal catalyst and methyl iodide promoter to produce a liquid reaction mixture including acetic acid, water, methyl acetate and methyl iodide; and (b) feeding the liquid reaction mixture at a feed temperature to a flash vessel which is maintained at a reduced pressure.
Claims14
A carbonylation process for producing acetic acid comprising:
- carbonylating methanol, methyl acetate, dimethyl ether, methyl formate, methyl iodide, or mixtures thereof in the presence of a rhodium metal catalyst in a reactor to produce a liquid reaction mixture comprising acetic acid, the rhodium metal catalyst, water, iodide catalyst stabilizer, methyl acetate and methyl iodide;
- flashing the liquid reaction mixture in a flash vessel to form a crude product vapor stream comprising acetic acid, methyl iodide, and methyl acetate, and a catalyst solution comprising the rhodium metal catalyst, iodide catalyst stabilizer, methyl acetate, and water;
- and
- an acetic acid collection step comprising:
- distilling the crude product vapor stream to form a first overhead, and a side stream comprising acetic acid;
- and
- distilling the side stream into a second overhead, and a purified acetic acid stream,
- wherein the catalyst solution comprises methyl acetate in an amount from 0.6 to 1.9% by weight and water in an amount from 1.0 to 2.6% by weight.
5 more elements
Dependencies are inferred from the claim text.